Printing-telegraph system



Patented Jan. 11, 1921.

//7 van/0r. Amos F DIXOl I.

A ffy.

i To all whom it may concern:

, circuit; One only of these stations, namely,

UNITED ,STATES PATENT OFFICE.

AMOS F. DIXON, OF NEWARK, NEW JERSEY, ASSIGNOR TO WESTERN ELECTRIC COK- PANY INCORPORATED, OF NEW YORK, N. Y., A CORPORATION OF NEW YORK,

PRINTING-TELEGRAPH SYSTEM.

, Specification of Letters I'atent. Patented J an, 11, 1921.

. Application filed February 14, 1918. Serial No. 217,098..

selectively operating the various record- Be it known that I/Anos F. DIXON, a ers. citizen of the United States, residing at Although this invention is illustrated by Newark, in the countyof Essex, State of a system utilizing a code having five im- New Jersey, have invented certain new and pulses for differentiating various signals, .useful Improvements in Printing-Telegraph it is to be understood that this invention is Systems, of 'which the following is a full, in no way restricted to such a system, and clear, concise, and exact description. that it is equally applicable to systems This invention relates to telegraph sysutilizing a code having more or less impulses tems'and particularly to printing telegraph for difi'erentiating the various signals. systems, Moreover, although the drawing shows but One object of thisinvention is to provide a single transmitter connected to one seca printing telegraph system equipped with "tion of a transmitting sunflower switch, and means for maintaining on the line circuit, a single recorder connected to one section which connects the various stations, a lowof a receiving sunflower switch, it is apfrequency' current for keeping the distribuparent 'that a number of transmitters and ters at the several stations in synchronism, recorders may be connected to other sections and, furthermore to provide means for seof the same sunflower switch in accordance lectively superposing high-frequency curwith usual practice. For convenience .in rents upon the low-frequency current in 1llu strat1ng the system, the-sections of the order tooperate selectively'th various revarious sunflower switches are shown decorders located at the several stations. .veloped.

In the printing telegraph system used for g describing this invention, sunflower transdrawing is a diagrammatic vlew of a printmitting and receiving distributers are dising telegraph system constructed in accordposed at the several stations along the line ance with this invention.

the terminal station is shown upon I the a terminal station 1 is provided with transe The revolving brushes for the re mltting apparatus 2, recording apparatus 3, ceiving and the transmitting distributers, anda suitable motor 1 for operating a re- The single figure in the accompanying Referring to the accompanying drawing,

when started, are continuously rotated by ceiving and a transmitting sunflower switch.-

any suitable motors, as, for example, La The transmitting apparatus 2 embodiesa Cour motors. One station,- and preferably section 5 0f a suitabletransmitting suna terminal station, is provided with means flower switch, having contact segments 6 to for impressing a current of relatively low 10, inclusive, which are successively confrequency upon the line circuit in order to nectedto opposite poles of a divided batoperate the various La Cour in'otors in tery 12, and contact segments 13 to 17, insynchronism with each other. At each staclusive, which are connected to a transmittion, a filter is provided for connecting the ter 19.' A suitable revolving brush'20, which receiving switch to line circuit, and a secis connected to a line circuit 21, is provided 0nd filter is provided for connect a curfor' bridging the contactsegments 6 to lt), rent generator of .a relatively hl h-freinclusive, and the contact segments 13 to quency through a transmitter, whi'c may 17, inclusive. 7

bea tape transmitter or a keyboard trans- The transmitter 19, which may be any mitter, to the transmitting sunflower switch, suitable tape or keyboard transmitter, em-

inorder that currents of high frequency bodies a plurality of contact terminals 22' may be selectively superposed upon the -to'26, inclusive, which are connectedgespec low frequency current which operates the tively, to the contact segments 13 1:017, in

- motors at the various stations, Thus, in e clusive, and contact terminals 28 to. 32,'in-' system constructed in accordance with this elusive, which are" selectivelyenga gedzby. inyention, low-frequency currents are mainthe contact terminals 22 to 26,-i nclusrvc. tamed on the line clrcuit foroperating the The contact terminals 28 to 32, inclusive, apparatus at the various stations in synchroare connected to ground through affilteremmsm, and high-freqi1ency currents are sebodying aninductive reactaiice34 and at calectively transmitted to the line circuitfor paclty reactance 35. The inductive reactance.34 is inductively connected to a relatively high-frequency generator 37 by means of a coil 36. I

The recording apparatus 3 embodies a section 40 of a sunflower receiving switch, which. comprises a common contact segment 41 and a plurality of contact segments 42 to 46, inclusive, which are connected through selecting magnets 47 to 51, inclusive, to ground. The contact segments 42 to 46, inclusive, are. connected successively to the contact segment 41 by means of a revolving brush A receiving filter which embodies an inductive reactance 53 and a capacity reactance 51, is connected between the line circuit 21 and the ground, and a relay 55 is inductively connected to the inductive reactance 53 by means of a coil 56. The relay 55 is provided with an armature 56 which, when operated, connects a battery 57 to the contact segment tl of the sunflower switch.

The La (Tour motor, which is a wellknown type of motor, embodies a magnetic disk (30 that is controlled by'two or more electromagnets G1 and (52. The two electromagnets (31 and 62 have impulses impressed upon them from a battery 63 that is under the control of a polarized line relay (3%.

Assuming the La. Cour motorrl to be in operation, it is apparent that the brush 20 in revolving over the segments of the trans mitting sunflower switch, will continuously impress impulses of alternate polarity upon the line circuit 21. These impulses of'low frequency from the battery 12 will operate the polarized relay (54 at the home station and the various polarized relays at the several stations along the line circuit for synchronously operating all the La. Cour motors. When the motor 1 is in operation, the contact terminals 22 to 26, inclusive, of the transmitter 19 may be selectively operated for impressing high frequency currents from the generator 37 upon the impulses that are transmitted to the line circuit 21 from battery 12. The high-frequency currents transinitted from the alternating-cu1= rent generator 37, will selectively operate. a recorder at any desired station in a manner to be hereinafter described. It should be noted, however, that the capacity rcactance 35 and the inductive reactance 3st prevent short-circuiting of the battery 12 through the segn'ients of the sunflower switch and the transmitter 19.

iissuming the filter at the station lto be adjusted to permitthe passage of currents of the same frequency as the high-frc p1ency current transmitted from a designated station, it is apparent that the relay will be operated whenever a high-frequencycurrent is received. The selective operation of the relay 55 and the rotation of the distributer brush 52 connecting the segments 42 to 46 inclusive sequentially with the common distributer ring 42 control the operation of the printing magnets 47 to 51, inclusive. The printing magnets 47 to 51 inclusive may be utilized for suitably operating any wellknown printing recorder.

It is obvious that by adjusting the filters at different stations to different frequencies,

the system may be made selective in that a station may transmit to one or more stations to the exclusion of the other stations on the same line. The necessary requirement for such a condition is that the filters at the station or stations with which communication is intended to be established, shall be adjusted to admit the passage of currents of the frequency sent out by the transmitting station, and that the filters at all other stations on the line shall be adj usted to exclude currents of that frequency.

Modifications in the system and arrangement and location of parts may be made within the spirit of the scope of this invention, and such modifications are intended to be covered by the appended claims.

What is claimed is:

1. In a telegraph system comprising a transmitting station and a receiving station, a line circuit connecting said stations, current impulse distributing mechanism at each of said stations, means at one of said stations for impressing on the line circuit reversals of current for synchronizing purposes, a plurality of movable contacts, means for selectively operating said contacts to impress on the line circuit, groups of high frequency signaling impulses, all of said impulses being of the same frequency, means at the receiving station responsive to said high frequency signaling impulses and signal responsive devices controlled by the conjoint action of said last mentioned means and said distributing mechanism.

2. In a telegraph system comprising a transmitting station and a receiving station, a line circuit connecting said stations, cur-- rent impulse distributing mechanism at each of said stations, means at one of said stations for impressing on the line circuit rcversals of current for synchronizing pur poses, a plurality of stationary contacts a source of alternating current supply connected to said contacts, a plurality of movable contacts normally connected to one of said current impulse distributors and adapted to be moved into engagement with said stationary contacts for impressing upon the line circuit groups of signaling impulses, all of which are of the same frequency, means at the receiving station responsive to said high frequency signaling impulses, and signal responsive devices controlled by the conjoint action of said last mentioned means and said distributing mechanism.

3. In a telegraph system comprising a transmitting station and a receiving station,

a line circuit connecting said stations, a source of synchronizing current at the transmitting station, a single source of alternating signaling current at the transmitting station, a plurality of selectively operable contacts for controlling the a plication of said signaling current to the hue circuit, means for operating said contacts simultaneously, current impulse distributing mechanism for v impressingv said synchronizlng current and said signaling current on the line simultaneously, means at the receiving station responsive only to the synchronizing current, means at the receiving station responsive only to the signaling current, recording mechanism at the receiving station, and current impulse distributing mechanism cooperating with said signaling current re-' sponsive means for controlling the operatio of said recorded mechanism.

In Witness whereof, I hereunto subscribe my name this 7th day of February, A. D;,

AMOS F, DIXON. 

